Autodesk Freewheel is down:
http://freewheel.autodesk.com/
Project Freewheel from Autdoesk Labs is up:
http://freewheel.labs.autodesk.com/
If you are using DWF files that are already on the web and have specified them to Freewheel using URLs, you can simply update your freewheel.autodesk.com references to freewheel.labs.autodesk.com and be able to see your designs.
Scott Sheppard
Program Manager
Autodesk Labs
Autodesk, Inc.